Improvement in shuttles for sewing-machines



J. c. WADE. SeWing-Machine Shuttle. I y l P'terted Aug. 17, 1869.-

ifnit-Bd 2%tatrz @atrnt dijijiirti Lettars Patemt No. 93,845, dateci August 17, 1869.

IIV.IIIE'R.OVIE!MIIN'J. IN SHU'ITIIIESS POR SEWING-MACHINES.

The Schedule refened to in these Lettere Patent and making part of the aa.me.

T0 alt whom it mayjconce-ru Be it known that I, J AMES C. WADE, of Boston, in the county of Sufi'olk, and State of Massachusetts, beve invented a. new and useful Improved Shuttle for Sewing-Maohines; end I do hereby declare that the following is a full end exact desoription thereof, reference being hitd to the aeoompenying dra,wings, and to the letters of referenoe marked thereon. My invention ,oonsists in un irnproved shuttle for sewing-machines, by lwhch the tension of a. thread may be variedor regulated, by means of a screw or spring, es desorib(ed below, at the wll of the operator, without taking the shuttle out of the machine. A Figure 1 represents the shuttle as it lies in the machine, with the he ad only of the screw A exposed to .view, byturning which, by a screw-driver or any proper implement, the tension of the thiead is reguluted.

B r'epresents the spring ra-ised from the shuttle, with the holes through which the thread has been passeri. K represents the spring lying in the shuttle in its proper position,with one end resting or secured in the slot x, (see Figure 2,) and the other end attached to the screw A, the thread of whieh, as the screw is' turned with e driver, moves the spring out or in, at the pleasure of the operator.

, 'lhe mode of att-aehing the spring-te the serew is es follows:

Through une end of the spring is made 2L hole of just sueh size a nd chur'aeter as to permit the screw part of A to' enter it, end yet confine the spring positively between its threads, so that it is not possible to shit't ts position thereon, to vary its degree of tension, except by turning the screw.

The screw-spi'ndle or stock is also so nppliecl, es hereinufter descrbed, thai: it neitheradvunces nor retreets by being turned, the screw, during such turning, tuking hold of end aotuuting nothing but the spring to graduate its pressure upon the bobbin-. thread.

The spring B, being so applied, is, therefore, tself -perfectly free to be turned up or down upon the screw D represents the long openin'g in the side of the shuttle, through whieh the 'thread J passes from the bobbin.

Figure 2 represents the.interior of the shuttle.

E is the bobbin. v I J 13 is the spring, with the threed J in it, throngh which the screw A, which regulates the tension,

' pnsses.

0 is the bloek of metal through 'rvhieh' the unthreecled portion of the screw A pesses, and which t is free to turn, a s seen in fig. 3..

F is the head of the small screw in the top of the lilook' 0. The inner end of this scr'ew pesses into an ennnlar groove neur the inner end of A, (see fig. 3, G,) end prevents the lurge screw frorn Working out or in.

Figure 3 shows the thread of the large screw. A, with the end of the spring .B confined imthe thread.

0 is the blok of metal iuto'whiohthe spindle of the large screw A passes.

F represents a sectiou of the small screw passing down into the gr oove G, in the lurge screw A, es des'eribecl above.

What I eluim, end desire to secure by Letters' Patent, is-

In a. sewingrnaehine shuttle, adupted for h'aving the tensiou of its thread adjnsted through an opeuing in its upper side, the serew-threaded spndle A, having no endwise mpVement, the thread of which aotuates end controls the pressure of a, spring thread-brake, substuntiall-y es deseribed. V

Also, the oombination,with a, shuttle, of the grooved and threeded spndle A,end its detaining-serew F and spring B, arranged and applieti suhstantially as shown end desoribed, end so that the screw-stock shell.neither ad vanoe nor recede during its revolution;

Also, the combnation, substztntially es described, of a, swiuging tensien-spring, B, with a, fulcrum which is a serew-t-hrezul, so that the fnlcrumed end shall be positively oonfined between the threuds of the screw, andbe free to turn thereon, while the adjust-ment of the screw Sh&ll vary the pressure of thefree end of the spring against the wullof the shuttle.

J AMES C. WADE.

Witnesses: e

H, W. WILLIAMS, O. E. DOOLITTLE. 

